A Magnetic polishing machine is a machine that utilizes magnetic abrasives to polish and deburr workpieces, and this machine is manufactured and used in China and many other countries. Magnetic polishing machines are very popular in the manufacture of parts for Metalworking, plastics, electronics, and other industries because they provide efficient, high-precision polishing results.

The statement that "there are no magnetic polishing machines abroad" may be inaccurate. In fact, as a widely used technology, magnetic polishing machines are produced and applied worldwide, including Europe, the United States, Japan and other industrially developed countries. Enterprises in different countries may carry out different technological innovations and adaptations to magnetic polishing machines according to their own market demand and level of technological development.

If there is indeed no magnetic polishing machine in some countries, the possible reasons include:

1. Market demand: the manufacturing industry in certain countries or regions is small, the demand for magnetic polishing machines is not large, so local manufacturers may not invest resources to produce such equipment.

2. Technical constraints: may be due to the limitations of the level of technological development, certain countries in the manufacture of precision machinery and equipment has not been able to reach the level of production of magnetic polishing machine.

3. Trade policy: certain countries may have restricted the import or production of such high-tech products due to trade policy.

4. Economic factors: the production of magnetic polishing machine requires high capital investment and advanced industrial base, the economic conditions of the more backward regions may not be able to carry out the production of such equipment for the time being.

When considering such issues, we should conduct a comprehensive analysis based on facts and figures to understand the actual situation of different countries in terms of technological development, market demand and so on. At the same time, with globalization and the increasingly frequent flow of technology, products and capital, the existence or otherwise of a certain technology or product in a country or region may change over time.